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Phase and group velocity for the wave function - Physics Forums While formally this can be called the phase velocity of the envelope, it is a convention to call it a group velocity (because the envelope groups together various waves, which then propagate "as a whole" inside the carrier envelope) Thus ##v_g = \Delta\omega \Delta k##, and you can imagine that in the limit this becomes a derivative ##v_g
Derivation of velocity in nth Bohr orbit • Physics Forums Homework Statement (a) Derive an expression for the electron's speed in the nth Bohr model (b) Prove that the orbit with highest speed is the n = 1 orbit,with v(1) = ke^2 h compare this with the speed of light , and comment on the validity of ignoring relativity (as we did) in
Solving for distance using only initial velocity and coefficient of . . . At the early point (probably around chapter 4) of an "elementary physics" textbook, a student encounters problems where, given an initial velocity and coefficient of friction, the student is expected to provide the resulting final displacement This is a stage of the textbook where kinetic energy equations and "work" equations have not yet been
Vinyl records, RPMs, and velocity. How does it work? My logic is that because the radius grows smaller, so too does the velocity of the groove as it moves under the stylus needle Because the stylus remains fixed, this means that the groove moves past the stylus faster at the edge, and slower near the center, and thus would produce an altered sound unless the grooves player were designed to
Is velocity ever a scalar quantity? - Physics Forums I thought velocity was always a vector quantity, one with both magnitude and direction When it came to the suvat equations, where v = final velocity, and u = initial velocity, I thought both of those were vector quantities, e g; v (final velocity) 112km hr North u (initial velocity) 0km hr
Vertical circular motion minimum speed proof - Physics Forums so the body reached the top let's take what happened so far, in reverse now the body has velocity of (rg)^0 5 to the other side, mg is still downward we KNOW the body will complete the half circle reversed motion, because we've just seen it complete it
Calculating Nozzle Flow Rate - Physics Forums for measuring velocity of water so we have to calculate velocity using head calculation or from stagnation pressure which we measure using a pitot tube Calculate Velocity from Head We can use Bernoulli's Equation to calculate velocity of a fluid from head Head is the distance from outlet to top of water V= 2gh V = Velocity m sec or feet per sec
Problem in understanding instantaneous velocity - Physics Forums The point where the tangent is drawn is the instantaneous velocity, and the slope of the secant is the average velocity If you let ##x_1## approach ##x_0,## which are moments in time, you finally receive the (yellow) tangent at ##x_0 ##
Invariance of 4-velocity - Physics Forums 4-velocity vector dot itself will not be equal to C^2, if we don't multiply time by coefficient C (speed of light) If we don't multiply time by the speed of light C, in Lorentz transformation equatins, the invariant tensor of U U will not be equal to c^2
How to find the initial velocity given only angle and distance traveled An object is shot (from a cannon) at an angle of 33 degrees and landed 85 m away Calculate the magnitude of the initial velocity (Hint:Look at the x direction and solve for Vox) Homework Equations Other questions I must answer If you have time, help with these would be great, however I think if I can just find the initial velocity I should be